[Chromecast] Cleanup the API for creating MediaPipelineBackend.

chromecast/media/audio/cast_audio_manager.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromecast/media/audio/cast_audio_manager.h"
 
-#include "chromecast/base/task_runner_impl.h"
 #include "chromecast/media/audio/cast_audio_output_stream.h"
 #include "chromecast/media/base/media_message_loop.h"
 #include "chromecast/public/cast_media_shlib.h"
 #include "chromecast/public/media/media_pipeline_backend.h"
-#include "chromecast/public/media/media_pipeline_device_params.h"
 
 namespace {
 // TODO(alokp): Query the preferred value from media backend.
 const int kDefaultSampleRate = 48000;
 
 // Define bounds for the output buffer size (in frames).
 // Note: These values are copied from AudioManagerPulse implementation.
 // TODO(alokp): Query the preferred value from media backend.
 static const int kMinimumOutputBufferSize = 512;
 static const int kMaximumOutputBufferSize = 8192;
@@ skipping 30 matching lines @@
 
 ::media::AudioParameters CastAudioManager::GetInputStreamParameters(
     const std::string& device_id) {
   LOG(WARNING) << "No support for input audio devices";
   // Need to send a valid AudioParameters object even when it will unused.
   return ::media::AudioParameters(
       ::media::AudioParameters::AUDIO_PCM_LOW_LATENCY,
       ::media::CHANNEL_LAYOUT_STEREO, 48000, 16, 1024);
 }
 
-scoped_ptr<MediaPipelineBackend>
-CastAudioManager::CreateMediaPipelineBackend() {
+scoped_ptr<MediaPipelineBackend> CastAudioManager::CreateMediaPipelineBackend(
+    const MediaPipelineDeviceParams& params) {
   DCHECK(media::MediaMessageLoop::GetTaskRunner()->BelongsToCurrentThread());
 
-  if (!backend_task_runner_)
-    backend_task_runner_.reset(new TaskRunnerImpl());
-
-  MediaPipelineDeviceParams device_params(
-      MediaPipelineDeviceParams::kModeIgnorePts, backend_task_runner_.get());
   return scoped_ptr<MediaPipelineBackend>(
-      CastMediaShlib::CreateMediaPipelineBackend(device_params));
+      CastMediaShlib::CreateMediaPipelineBackend(params));
 }
 
 ::media::AudioOutputStream* CastAudioManager::MakeLinearOutputStream(
     const ::media::AudioParameters& params) {
   DCHECK_EQ(::media::AudioParameters::AUDIO_PCM_LINEAR, params.format());
   return new CastAudioOutputStream(params, this);
 }
 
 ::media::AudioOutputStream* CastAudioManager::MakeLowLatencyOutputStream(
     const ::media::AudioParameters& params,
@@ skipping 35 matching lines @@
   }
 
   ::media::AudioParameters output_params(
       ::media::AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout,
       sample_rate, bits_per_sample, buffer_size);
   return output_params;
 }
 
 }  // namespace media
 }  // namespace chromecast